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- Northwest, Pacific 128
- Rivers 97
- Photography 96
- Bodies of water 89
- River engineering 58
- United States. Congress--Records and correspondence 53
- River surveys 30
- Tourism 29
- Mountains 26
- Riparian areas 26
- River channels 26
- Harbors 22
- Scenic byways 18
- Canals 17
- Rapids 16
- West (U.S.) 16
- Formations (Geology) 14
- Maps 14
- Waterfalls 14
- Nature 13